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        <li></li>
        <li><a href="#methodchannel">MethodChannel</a></li>
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    <article class="post">
        <header>
            <h1 class="post-title">Flutter与原生通讯2</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月14日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <blockquote>
<p>Flutter 混合开发系列 包含如下：</p>
<ul>
<li>嵌入原生View-Android</li>
<li>嵌入原生View-iOS</li>
<li><strong>与原生通信-MethodChannel</strong></li>
<li>与原生通信-BasicMessageChannel</li>
<li>与原生通信-EventChannel</li>
<li>添加 Flutter 到 Android Activity</li>
<li>添加 Flutter 到 Android Fragment</li>
<li>添加 Flutter 到 iOS</li>
</ul>
<p>每个工作日分享一篇，欢迎关注、点赞及转发。</p>
</blockquote>
<h4 id="平台通信的3中方式">平台通信的3中方式</h4>
<p>Flutter 与 Native 端通信有如下3个方法：</p>
<ul>
<li><strong>MethodChannel</strong>：Flutter 与 Native 端相互调用，调用后可以返回结果，可以 Native 端主动调用，也可以Flutter主动调用，属于双向通信。此方式为最常用的方式， Native 端调用需要在主线程中执行。</li>
<li><strong>BasicMessageChannel</strong>：用于使用指定的编解码器对消息进行编码和解码，属于双向通信，可以 Native 端主动调用，也可以Flutter主动调用。</li>
<li><strong>EventChannel</strong>：用于数据流(event streams)的通信， Native 端主动发送数据给 Flutter，通常用于状态的监听，比如网络变化、传感器数据等。</li>
</ul>
<h4 id="通信架构图">通信架构图</h4>
<p>此图为官方的<a href="https://link.juejin.cn?target=https%3A%2F%2Fflutter.dev%2Fdocs%2Fdevelopment%2Fplatform-integration%2Fplatform-channels">架构图</a></p>
<p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/971fe1636576451d88376144f75ebb9a~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/971fe1636576451d88376144f75ebb9a~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>Flutter 与 Native 端通信是异步的。</p>
<h4 id="通信与平台线程">通信与平台线程</h4>
<p>Native 端主动发送数据给 Flutter时，Native 端代码需要在主线程中执行，Android 端从子线程跳转到主线程方式：</p>
<p>Kotlin 代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin">Handler(Looper.getMainLooper()).post {
  
}
  
</code></pre></div><p>Java 代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">new</span> Handler<span style="color:#f92672">(</span>Looper<span style="color:#f92672">.</span><span style="color:#a6e22e">getMainLooper</span><span style="color:#f92672">()).</span><span style="color:#a6e22e">post</span><span style="color:#f92672">(</span><span style="color:#66d9ef">new</span> Runnable<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
  <span style="color:#a6e22e">@Override</span>
  <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">run</span><span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
    
  <span style="color:#f92672">}</span>
<span style="color:#f92672">});</span>
  
</code></pre></div><p>如果可以获取到当前 Activity，也可以使用如下方式：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin">activity.runOnUiThread {
   
}
  
</code></pre></div><p>iOS 端从子线程跳转到主线程方式：</p>
<p>Objective-C 代码：</p>
<pre><code>dispatch_async(dispatch_get_main_queue(), ^{
  
});
  
</code></pre><p>Swift 代码：</p>
<pre><code>DispatchQueue.main.async {
  
}
  
</code></pre><h3 id="methodchannel">MethodChannel</h3>
<h4 id="flutter-端">Flutter 端</h4>
<p>Flutter 端创建 <strong>MethodChannel</strong> 通道，用于与原生端通信：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> channel <span style="color:#f92672">=</span> MethodChannel(<span style="color:#e6db74">&#39;com.flutter.guide.MethodChannel&#39;</span>);
  
</code></pre></div><p><strong>com.flutter.guide.MethodChannel</strong> 是 MethodChannel 的名称，原生端要与之对应。</p>
<p>发送消息：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> result <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> channel.invokeMethod(<span style="color:#e6db74">&#39;sendData&#39;</span>,{<span style="color:#e6db74">&#39;name&#39;</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;laomeng&#39;</span>, <span style="color:#e6db74">&#39;age&#39;</span><span style="color:#f92672">:</span> <span style="color:#ae81ff">18</span>})
  
</code></pre></div><ul>
<li>第一个参数表示<strong>method</strong>，方法名称，原生端会解析此参数。</li>
<li>第二个参数表示参数，类型任意，多个参数通常使用<strong>Map</strong>。</li>
<li>返回 <strong>Future</strong>，原生端返回的数据。</li>
</ul>
<p>完整代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MethodChannelDemo</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  _MethodChannelDemoState createState() <span style="color:#f92672">=&gt;</span> _MethodChannelDemoState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_MethodChannelDemoState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>MethodChannelDemo<span style="color:#f92672">&gt;</span> {
  <span style="color:#66d9ef">var</span> channel <span style="color:#f92672">=</span> MethodChannel(<span style="color:#e6db74">&#39;com.flutter.guide.MethodChannel&#39;</span>);

  <span style="color:#66d9ef">var</span> _data;

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          SizedBox(
            height: <span style="color:#ae81ff">50</span>,
          ),
          RaisedButton(
            child: Text(<span style="color:#e6db74">&#39;发送数据到原生&#39;</span>),
            onPressed: () <span style="color:#66d9ef">async</span> {
              <span style="color:#66d9ef">var</span> result <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> channel
                  .invokeMethod(<span style="color:#e6db74">&#39;sendData&#39;</span>, {<span style="color:#e6db74">&#39;name&#39;</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;laomeng&#39;</span>, <span style="color:#e6db74">&#39;age&#39;</span><span style="color:#f92672">:</span> <span style="color:#ae81ff">18</span>});
              <span style="color:#66d9ef">var</span> name <span style="color:#f92672">=</span> result[<span style="color:#e6db74">&#39;name&#39;</span>];
              <span style="color:#66d9ef">var</span> age <span style="color:#f92672">=</span> result[<span style="color:#e6db74">&#39;age&#39;</span>];
              setState(() {
                _data <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">$</span>name<span style="color:#e6db74">,</span><span style="color:#e6db74">$</span>age<span style="color:#e6db74">&#39;</span>;
              });
            },
          ),
          Text(<span style="color:#e6db74">&#39;原生返回数据：</span><span style="color:#e6db74">$</span>_data<span style="color:#e6db74">&#39;</span>)
        ],
      ),
    );
  }
}
  
</code></pre></div><h4 id="android-端">Android 端</h4>
<p>android 下创建 <strong>MethodChannelDemo</strong>：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin"><span style="color:#66d9ef">package</span> com.flutter.guide

<span style="color:#66d9ef">import</span> io.flutter.plugin.common.BinaryMessenger
<span style="color:#66d9ef">import</span> io.flutter.plugin.common.MethodCall
<span style="color:#66d9ef">import</span> io.flutter.plugin.common.MethodChannel

<span style="color:#75715e">/**
</span><span style="color:#75715e"> * des:
</span><span style="color:#75715e"> */</span>
<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MethodChannelDemo</span>(messenger: BinaryMessenger): MethodChannel.MethodCallHandler {

    <span style="color:#66d9ef">private</span> <span style="color:#66d9ef">var</span> channel: MethodChannel

    <span style="color:#66d9ef">init</span> {
        channel = MethodChannel(messenger, <span style="color:#e6db74">&#34;com.flutter.guide.MethodChannel&#34;</span>)
        channel.setMethodCallHandler(<span style="color:#66d9ef">this</span>)
    }

    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">onMethodCall</span>(call: MethodCall, result: MethodChannel.Result) {
        
    }
}
  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fdf2ed2f86994c2e9d30aba49cd96f51~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fdf2ed2f86994c2e9d30aba49cd96f51~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p><strong>onMethodCall</strong> 方法在 Flutter 端调用 invokeMethod 方法回调，解析方法如下：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin"><span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">onMethodCall</span>(call: MethodCall, result: MethodChannel.Result) {
    <span style="color:#66d9ef">if</span> (call.method <span style="color:#f92672">==</span> <span style="color:#e6db74">&#34;sendData&#34;</span>) {
        <span style="color:#66d9ef">val</span> name = call.argument(<span style="color:#e6db74">&#34;name&#34;</span>) <span style="color:#66d9ef">as</span> String?
        <span style="color:#66d9ef">val</span> age = call.argument(<span style="color:#e6db74">&#34;age&#34;</span>) <span style="color:#66d9ef">as</span> Int?

        <span style="color:#66d9ef">var</span> map = mapOf(<span style="color:#e6db74">&#34;name&#34;</span> to <span style="color:#e6db74">&#34;hello,</span><span style="color:#e6db74">$name</span><span style="color:#e6db74">&#34;</span>,
                <span style="color:#e6db74">&#34;age&#34;</span> to <span style="color:#e6db74">&#34;</span><span style="color:#e6db74">$age</span><span style="color:#e6db74">&#34;</span>
        )
        result.success(map)
    }
}
  
</code></pre></div><ul>
<li><strong>call.method</strong> 字符串就是 invokeMethod 方法传入的 <strong>method</strong>。</li>
<li><strong>call.argument</strong> 是 invokeMethod 传入的参数，由于 Flutter 端传入的是 Map，所以上面的解析按照 Map 解析。</li>
<li><strong>result.success()</strong> 是返回给 Flutter 的结果。</li>
</ul>
<p>Flutter 端解析：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> result <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> channel
    .invokeMethod(<span style="color:#e6db74">&#39;sendData&#39;</span>, {<span style="color:#e6db74">&#39;name&#39;</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;laomeng&#39;</span>, <span style="color:#e6db74">&#39;age&#39;</span><span style="color:#f92672">:</span> <span style="color:#ae81ff">18</span>});
<span style="color:#66d9ef">var</span> name <span style="color:#f92672">=</span> result[<span style="color:#e6db74">&#39;name&#39;</span>];
<span style="color:#66d9ef">var</span> age <span style="color:#f92672">=</span> result[<span style="color:#e6db74">&#39;age&#39;</span>];
  
</code></pre></div><blockquote>
<p>两端的解析要相互对应。</p>
</blockquote>
<p>在 <strong>MainActivity</strong> 启动：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MainActivity</span> : FlutterActivity() {
    
    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">configureFlutterEngine</span>(flutterEngine: FlutterEngine) {
        <span style="color:#66d9ef">super</span>.configureFlutterEngine(flutterEngine)
        MethodChannelDemo(flutterEngine.dartExecutor.binaryMessenger)
    }
}
  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0cfb04c8c0214139b6d61ac0f3bed411~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0cfb04c8c0214139b6d61ac0f3bed411~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<h4 id="ios-端">iOS 端</h4>
<p>ios 下创建 <strong>MethodChannelDemo</strong>，按如下方式：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-swift" data-lang="swift"><span style="color:#66d9ef">import</span> <span style="color:#a6e22e">Flutter</span>
<span style="color:#66d9ef">import</span> <span style="color:#a6e22e">UIKit</span>

<span style="color:#66d9ef">public</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MethodChannelDemo</span> {
    
    <span style="color:#66d9ef">init</span>(messenger: FlutterBinaryMessenger) {
        <span style="color:#66d9ef">let</span> channel = FlutterMethodChannel(name: <span style="color:#e6db74">&#34;com.flutter.guide.MethodChannel&#34;</span>, binaryMessenger: messenger)
        channel.setMethodCallHandler { (call:FlutterMethodCall, result:@escaping FlutterResult) <span style="color:#66d9ef">in</span>
            <span style="color:#66d9ef">if</span> (call.method == <span style="color:#e6db74">&#34;sendData&#34;</span>) {
                <span style="color:#66d9ef">if</span> <span style="color:#66d9ef">let</span> dict = call.arguments <span style="color:#66d9ef">as</span>? Dictionary&lt;String, Any&gt; {
                    <span style="color:#66d9ef">let</span> name:String = dict[<span style="color:#e6db74">&#34;name&#34;</span>] <span style="color:#66d9ef">as</span>? String ?? <span style="color:#e6db74">&#34;&#34;</span>
                    <span style="color:#66d9ef">let</span> age:Int = dict[<span style="color:#e6db74">&#34;age&#34;</span>] <span style="color:#66d9ef">as</span>? Int ?? <span style="color:#f92672">-</span><span style="color:#ae81ff">1</span>
                    result([<span style="color:#e6db74">&#34;name&#34;</span>:<span style="color:#e6db74">&#34;hello,</span><span style="color:#e6db74">\(</span>name<span style="color:#e6db74">)</span><span style="color:#e6db74">&#34;</span>,<span style="color:#e6db74">&#34;age&#34;</span>:age])
                }
            }
        }
    }
}

  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/32c25cc5ec1547a1ba2fe55aa185066a~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/32c25cc5ec1547a1ba2fe55aa185066a~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>在 <strong>AppDelegate</strong> 启动：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-swift" data-lang="swift"><span style="color:#66d9ef">import</span> <span style="color:#a6e22e">UIKit</span>
<span style="color:#66d9ef">import</span> <span style="color:#a6e22e">Flutter</span>

<span style="color:#66d9ef">@UIApplicationMain</span>
<span style="color:#66d9ef">@objc</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">AppDelegate</span>: FlutterAppDelegate {
  <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">func</span> <span style="color:#a6e22e">application</span>(
    <span style="color:#66d9ef">_</span> application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -&gt; Bool {
    
    <span style="color:#66d9ef">let</span> controller : FlutterViewController = window?.rootViewController <span style="color:#66d9ef">as</span>! FlutterViewController
    MethodChannelDemo(messenger: controller.binaryMessenger)
    GeneratedPluginRegistrant.register(with: <span style="color:#66d9ef">self</span>)
    
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">super</span>.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2752886e9f654294aa88b13f90ce24e4~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2752886e9f654294aa88b13f90ce24e4~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<h4 id="原生端主动发送消息给flutter">原生端主动发送消息给Flutter</h4>
<h5 id="flutter-端接收数据">Flutter 端接收数据</h5>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#960050;background-color:#1e0010">@</span>override
<span style="color:#66d9ef">void</span> initState() {
  <span style="color:#66d9ef">super</span>.initState();
  channel.setMethodCallHandler((call) {
    setState(() {
      _nativeData <span style="color:#f92672">=</span> call.arguments[<span style="color:#e6db74">&#39;count&#39;</span>];
    });
  });
}
  
</code></pre></div><h5 id="android-发送数据">Android 发送数据</h5>
<p>原生端启动定时器，每隔一秒向 Flutter 发送数据，Android 端代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MethodChannelDemo</span>(<span style="color:#66d9ef">var</span> activity: Activity, messenger: BinaryMessenger) <span style="color:#f92672">:</span> MethodChannel.MethodCallHandler {

    private <span style="color:#66d9ef">var</span> channel: MethodChannel
    private <span style="color:#66d9ef">var</span> count <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>

    init {
        channel <span style="color:#f92672">=</span> MethodChannel(messenger, <span style="color:#e6db74">&#34;com.flutter.guide.MethodChannel&#34;</span>)
        channel.setMethodCallHandler(<span style="color:#66d9ef">this</span>)
        startTimer()
    }


    fun startTimer() {
        <span style="color:#66d9ef">var</span> timer <span style="color:#f92672">=</span> Timer().schedule(timerTask {
            activity.runOnUiThread {
                <span style="color:#66d9ef">var</span> map <span style="color:#f92672">=</span> mapOf(<span style="color:#e6db74">&#34;count&#34;</span> to count<span style="color:#f92672">++</span>)
                channel.invokeMethod(<span style="color:#e6db74">&#34;timer&#34;</span>, map)
            }
        }, <span style="color:#ae81ff">0</span>, <span style="color:#ae81ff">1000</span>)

    }

    override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
        <span style="color:#66d9ef">if</span> (call.method <span style="color:#f92672">==</span> <span style="color:#e6db74">&#34;sendData&#34;</span>) {
            val name <span style="color:#f92672">=</span> call.argument(<span style="color:#e6db74">&#34;name&#34;</span>) <span style="color:#f92672">as</span> <span style="color:#66d9ef">String</span><span style="color:#f92672">?</span>
            val age <span style="color:#f92672">=</span> call.argument(<span style="color:#e6db74">&#34;age&#34;</span>) <span style="color:#f92672">as</span> Int<span style="color:#f92672">?</span>

            <span style="color:#66d9ef">var</span> map <span style="color:#f92672">=</span> mapOf(<span style="color:#e6db74">&#34;name&#34;</span> to <span style="color:#e6db74">&#34;hello,</span><span style="color:#e6db74">$</span>name<span style="color:#e6db74">&#34;</span>,
                    <span style="color:#e6db74">&#34;age&#34;</span> to <span style="color:#e6db74">&#34;</span><span style="color:#e6db74">$</span>age<span style="color:#e6db74">&#34;</span>
            )
            result.success(map)
        }
    }
}
  
</code></pre></div><blockquote>
<p>注意：Android 端发送数据要在<strong>主现场</strong>中调用，即：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin">activity.runOnUiThread {
             <span style="color:#66d9ef">var</span> map = mapOf(<span style="color:#e6db74">&#34;count&#34;</span> to count<span style="color:#f92672">++</span>)
             channel.invokeMethod(<span style="color:#e6db74">&#34;timer&#34;</span>, map)
         }
  
</code></pre></div></blockquote>
<p>启动修改如下：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MainActivity</span> : FlutterActivity() {

    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">configureFlutterEngine</span>(flutterEngine: FlutterEngine) {
        <span style="color:#66d9ef">super</span>.configureFlutterEngine(flutterEngine)
        MethodChannelDemo(<span style="color:#66d9ef">this</span>,flutterEngine.dartExecutor.binaryMessenger)
        flutterEngine.plugins.add(MyPlugin())
    }
}
  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b05f3f5b2ba54ed2b89036faf20c3b13~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b05f3f5b2ba54ed2b89036faf20c3b13~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<h5 id="ios-发送数据">iOS 发送数据</h5>
<p>iOS 端启动定时器代码如下：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> Flutter
import UIKit

public class MethodChannelDemo <span style="color:#960050;background-color:#1e0010">{</span>
    var count <span style="color:#960050;background-color:#1e0010">=</span>  <span style="color:#960050;background-color:#1e0010">0</span>
    var channel<span style="color:#960050;background-color:#1e0010">:</span>FlutterMethodChannel
    init<span style="color:#960050;background-color:#1e0010">(</span>messenger<span style="color:#960050;background-color:#1e0010">:</span> FlutterBinaryMessenger<span style="color:#960050;background-color:#1e0010">)</span> <span style="color:#960050;background-color:#1e0010">{</span>
        channel <span style="color:#960050;background-color:#1e0010">=</span> FlutterMethodChannel<span style="color:#960050;background-color:#1e0010">(</span>name<span style="color:#960050;background-color:#1e0010">:</span> <span style="color:#e6db74">&#34;com.flutter.guide.MethodChannel&#34;</span>, binaryMessenger<span style="color:#960050;background-color:#1e0010">:</span> messenger<span style="color:#960050;background-color:#1e0010">)</span>
        channel<span style="color:#960050;background-color:#1e0010">.</span>setMethodCallHandler <span style="color:#960050;background-color:#1e0010">{</span> <span style="color:#960050;background-color:#1e0010">(</span>call<span style="color:#960050;background-color:#1e0010">:</span>FlutterMethodCall, result<span style="color:#960050;background-color:#1e0010">:@</span>escaping FlutterResult<span style="color:#960050;background-color:#1e0010">)</span> in
            if <span style="color:#960050;background-color:#1e0010">(</span>call<span style="color:#960050;background-color:#1e0010">.</span>method <span style="color:#960050;background-color:#1e0010">==</span> <span style="color:#e6db74">&#34;sendData&#34;</span><span style="color:#960050;background-color:#1e0010">)</span> <span style="color:#960050;background-color:#1e0010">{</span>
                if let dict <span style="color:#960050;background-color:#1e0010">=</span> call<span style="color:#960050;background-color:#1e0010">.</span>arguments <span style="color:#66d9ef">as</span><span style="color:#960050;background-color:#1e0010">?</span> Dictionary<span style="color:#960050;background-color:#1e0010">&lt;</span>String, Any<span style="color:#960050;background-color:#1e0010">&gt;</span> <span style="color:#960050;background-color:#1e0010">{</span>
                    let name<span style="color:#960050;background-color:#1e0010">:</span>String <span style="color:#960050;background-color:#1e0010">=</span> dict<span style="color:#960050;background-color:#1e0010">[</span><span style="color:#e6db74">&#34;name&#34;</span><span style="color:#960050;background-color:#1e0010">]</span> <span style="color:#66d9ef">as</span><span style="color:#960050;background-color:#1e0010">?</span> String <span style="color:#960050;background-color:#1e0010">??</span> <span style="color:#e6db74">&#34;&#34;</span>
                    let age<span style="color:#960050;background-color:#1e0010">:</span>Int <span style="color:#960050;background-color:#1e0010">=</span> dict<span style="color:#960050;background-color:#1e0010">[</span><span style="color:#e6db74">&#34;age&#34;</span><span style="color:#960050;background-color:#1e0010">]</span> <span style="color:#66d9ef">as</span><span style="color:#960050;background-color:#1e0010">?</span> Int <span style="color:#960050;background-color:#1e0010">??</span> <span style="color:#960050;background-color:#1e0010">-1</span>
                    result<span style="color:#960050;background-color:#1e0010">([</span><span style="color:#e6db74">&#34;name&#34;</span><span style="color:#960050;background-color:#1e0010">:</span><span style="color:#e6db74">&#34;hello,</span><span style="color:#960050;background-color:#1e0010">\</span><span style="color:#e6db74">(name)&#34;</span>,<span style="color:#e6db74">&#34;age&#34;</span><span style="color:#960050;background-color:#1e0010">:</span>age<span style="color:#960050;background-color:#1e0010">])</span>
                <span style="color:#960050;background-color:#1e0010">}</span>
            <span style="color:#960050;background-color:#1e0010">}</span>
        <span style="color:#960050;background-color:#1e0010">}</span>
        startTimer<span style="color:#960050;background-color:#1e0010">()</span>
    <span style="color:#960050;background-color:#1e0010">}</span>
    
    func startTimer<span style="color:#960050;background-color:#1e0010">()</span> <span style="color:#960050;background-color:#1e0010">{</span>
        var timer <span style="color:#960050;background-color:#1e0010">=</span> Timer<span style="color:#960050;background-color:#1e0010">.</span>scheduledTimer<span style="color:#960050;background-color:#1e0010">(</span>timeInterval<span style="color:#960050;background-color:#1e0010">:1</span>, target<span style="color:#960050;background-color:#1e0010">:</span> self, selector<span style="color:#960050;background-color:#1e0010">:#</span>selector<span style="color:#960050;background-color:#1e0010">(</span>self<span style="color:#960050;background-color:#1e0010">.</span>tickDown<span style="color:#960050;background-color:#1e0010">)</span>,userInfo<span style="color:#960050;background-color:#1e0010">:</span>nil,repeats<span style="color:#960050;background-color:#1e0010">:</span> true<span style="color:#960050;background-color:#1e0010">)</span>
    <span style="color:#960050;background-color:#1e0010">}</span>
    <span style="color:#960050;background-color:#1e0010">@</span>objc func tickDown<span style="color:#960050;background-color:#1e0010">(){</span>
        count <span style="color:#960050;background-color:#1e0010">+=</span> <span style="color:#960050;background-color:#1e0010">1</span>
        var args <span style="color:#960050;background-color:#1e0010">=</span> <span style="color:#960050;background-color:#1e0010">[</span><span style="color:#e6db74">&#34;count&#34;</span><span style="color:#960050;background-color:#1e0010">:</span>count<span style="color:#960050;background-color:#1e0010">]</span>
        channel<span style="color:#960050;background-color:#1e0010">.</span>invokeMethod<span style="color:#960050;background-color:#1e0010">(</span><span style="color:#e6db74">&#34;timer&#34;</span>, arguments<span style="color:#960050;background-color:#1e0010">:</span>args<span style="color:#960050;background-color:#1e0010">)</span>
    <span style="color:#960050;background-color:#1e0010">}</span>
<span style="color:#960050;background-color:#1e0010">}</span>

  
</code></pre></div><p>
        <a data-fancybox="gallery" href="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/1cb98e88f11248338f65de502e050071~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https:////p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/1cb98e88f11248338f65de502e050071~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>

        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/Flutter/flutter%E4%B8%8E%E5%8E%9F%E7%94%9F%E9%80%9A%E8%AE%AF2/">https://luckly.work/post/Flutter/flutter%E4%B8%8E%E5%8E%9F%E7%94%9F%E9%80%9A%E8%AE%AF2/</a></li>
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        <li><a href="/post/Flutter/flutter2%E6%BA%90%E7%A0%81%E9%98%85%E8%AF%BB/">Flutter2源码阅读</a></li>
        
        <li><a href="/post/flutter_tips/%E8%BD%BB%E6%9D%BE%E4%BD%BF%E7%94%A8flutter1/">Dart &amp; Flutter 开发技巧 1-7</a></li>
        
        <li><a href="/post/flutter_tips/%E8%BD%BB%E6%9D%BE%E4%BD%BF%E7%94%A8flutter3/">Dart &amp; Flutter 开发技巧 15-21</a></li>
        
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